CN103525971B - Vanadium slag modifier and preparation method thereof, and vanadium-extracting revolving furnace slag-splashing furnace-protecting method - Google Patents
Vanadium slag modifier and preparation method thereof, and vanadium-extracting revolving furnace slag-splashing furnace-protecting method Download PDFInfo
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Abstract
The invention provides a vanadium slag modifier and a preparation method thereof, and a vanadium-extracting revolving furnace slag-splashing furnace-protecting method. The vanadium slag modifier comprises the components by weight: 2-5 parts of C, 40-60 parts of MgO, 4-7 parts of CaO, 10-30 parts of MnO, 5-15 parts of SiO2, and water with the content of less than 3%. The preparation method comprises the steps of mixing uniformly 40-50 parts of magnesite, 5-10 parts of a carbon-containing material and 40-60 parts of a manganese mine according to the weight, so as to obtain the vanadium slag modifier. Compared with the prior art, the vanadium slag modifier has the beneficial effects that the vanadium slag modifier can provide the high-quality vanadium slag modifier for a vanadium-extracting revolving furnace; the vanadium slag modifier can effectively improve the vanadium slag melting point and adhesiveness, enhances the slag splashing effect, improves the anti-washout ability of a furnace lining, and thereby effectively improving the life of the vanadium-extracting revolving furnace lining; and in addition, the vanadium slag modifier has simple production process.
Description
Technical field
The invention belongs to vanadium extraction by converter blowing technical field, specifically, relate to a kind of vanadium slag modification agent for converter extracting vanadium and preparation method thereof, and a kind of converter extracting vanadium protecting method with splash slag using this vanadium slag modification agent.
Background technology
Converter is the main equipment that iron and steel enterprise produces, and its life-span is directly connected to the production cost of converter.In order to improve life of converter, the mid-90 in 20th century, first LTV company of the U.S. develops and adopts Technology of Slag Splashingfor Furnace Maintenance, significantly improves converter lining life, is risen to 15658 heats of nineteen ninety-five by 6200 heats of nineteen ninety.After adopting Technology of Slag Splashingfor Furnace Maintenance, the consumption of converter refractory materials reduces about 25% ~ 50%.Japan's converter lining life is not high, generally at 6000 ~ 8000 stoves.Under slag splashing condition, Wuhan Iron and Steel Plant is by the systematic study of converter long service life, and the highest furnace life reaches more than 30,000 stoves, and multiple blown converter the highest more than 10,000 stoves in age of Baosteel, generally at 6000 ~ 8000 stoves.
Protecting method with splash slag is divided into horizontal spray gun method, horizontal bottom blowing method, marksmanship of the vertical end, horizontal flame spraying, upright spray gun method etc.The situations such as the process characteristic of various method and relative merits are as shown in table 1.
At present, what generally adopt is vertical oxygen marksmanship.Its process characteristic is: utilize top blow oxygen lance to switch nitrogen, splash, through the finishing slag of modification, is coated in converter lining inwall.By the change of spray angle, can on purpose concentrate certain position of splash.Before blowing, add the excessive rhombspar of people and lime, because oversaturated magnesium oxide slag alleviates the erosion of furnace lining mutually between the blowing process.In addition, foamy slag forms protective layer on furnace lining.Improving the bonding strength of to spatter between slag blanket and backup lining brick the two, is the key improving slag splashing effect.
Converter extracting vanadium due to its production singularity, its safeguard and long service life technical study less, particularly converter extracting vanadium Technology of Slag Splashingfor Furnace Maintenance has no report.Because tap to tap time is short, temperature is low, in slag, eutectic mixture composition is few, slag fluidity is poor for converter extracting vanadium, before arrival extraction smelting of vanadium terminal, and C and O reaction not fully expansion in molten iron, PCO, PCO in furnace gas
2lower, and PO
2higher, slag bad adhesion, causes magnesia carbon brick to be exposed in oxygen atmosphere, impels C and O
2reaction, the above lining erosion speed of iron liquid level is below iron liquid level.The above furnace lining of iron liquid level is the mode repeated action peeling off by the direct decarburization of oxygen → loose embrittlement → erosion → reoxidize substantially, and brick body is deteriorated gradually.Produce vanadium rate for improving as far as possible, extraction smelting of vanadium is relatively stricter to Control for Kiln Temperature, and the mode adding part pig usually can be adopted to carry out auxiliary temperature-reducing.So charging side not only by the impact of molten iron, also will be subject to the impact of pig, because furnace temperature is low, slag, in block, carries out omnidistance rigid mechanical shock to operational layer brick during blowing together with molten iron, therefore mechanical shock is the major cause of converter extracting vanadium converter bottom and body bottom damage.Different from steel-making converter, the vanadium slag fusing point that converter extracting vanadium is produced is low, high containing vanadium, low containing MgO, and when spattering slag, dross difficulty, therefore needs to carry out modifying process to vanadium slag.
Publication number be CN102534099A patent document discloses a kind of magnesium carbon ball improving splashing slag in converter effect, this patent documentation relates to a kind of metallurgical steel-making converter modification agent, i.e. a kind of magnesium carbon ball improving splashing slag in converter effect.Its starting material composition and mass percent as follows: C:35%, MgO:55%, H
2o:10%.Publication number be CN102643947A patent document discloses a kind of method shortening the splashing slag in converter time, this patent documentation is mentioned and is carried out upgrading as modulation refrigerant to slag with Wingdale and rhombspar.Publication number is the residue adjustment treatment process that patent document discloses before a kind of splashing slag in converter of CN102392097A, this patent documentation adopts coke powder, magnesia, titanium dioxide to make slag supplying agent, the ferric oxide stayed in slag is reduced with coke powder, and react with titanium dioxide and generate dystectic titanium carbide, titanium carbide and magnesia act synergistically the viscosity and temperature of fusion that improve slag.But, above method all with steel-making converter slag for object, do not relate to converter extracting vanadium slag splashing.
Therefore, a kind of vanadium slag modification agent being applicable to converter extracting vanadium is needed badly.
Summary of the invention
The object of the invention is to solve at least one item in above-mentioned prior art problem.
Such as, an object of the present invention is that providing a kind of is suitable for vanadium slag modification agent of converter extracting vanadium vanadium slag use and preparation method thereof.
An aspect of of the present present invention provides a kind of vanadium slag modification agent.The composition of described vanadium slag modification agent comprise by weight 2 ~ 5 parts C, 40 ~ 60 parts MgO, the CaO of 4 ~ 7 parts, the MnO of 10 ~ 30 parts, the SiO of 5 ~ 15 parts
2, and the moisture content in described vanadium slag modification agent is less than 3%.
Another aspect provides a kind of method preparing vanadium slag modification agent.Described method is by the magnesia of 40 ~ 50 parts, the manganese ore of 5 ~ 10 parts of carbonaceous materials and 40 ~ 60 parts mix by weight, to obtain vanadium slag modification agent, the composition of described vanadium slag modification agent comprise by weight percentage 2 ~ 5 parts C, the MgO of 40 ~ 60 parts, the CaO of 4 ~ 7 parts, 10 ~ 30 parts MnO and 5 ~ 15 part SiO
2, and the moisture content in described vanadium slag modification agent is less than 3%, wherein, described manganese ore by weight percentage containing be greater than 40% MnO, be less than the CaO of 15% and be less than the SiO of 25%
2, described carbonaceous material is the material containing simple substance carbon.
Another aspect of the present invention provides a kind of converter extracting vanadium protecting method with splash slag.Said method comprising the steps of: adopt converter extracting vanadium to smelt vanadium-bearing hot metal, to obtain half steel and vanadium slag; Go out half steel, and indwelling predetermined amount vanadium slag is in converter extracting vanadium; In the vanadium slag of indwelling in converter extracting vanadium, add vanadium slag modification agent as above, then carry out slag splashing.
Compared with prior art, beneficial effect of the present invention comprises: can provide the vanadium slag modification agent of high-quality for converter extracting vanadium; Can effectively improve vanadium slag fusing point and adhesivity, strengthen and spatter slag effect, improve furnace lining erosion resistibility, thus effectively improve converter extracting vanadium lining life; In addition, production technique is simple.
Embodiment
Hereinafter, vanadium slag modification agent of the present invention and preparation method thereof and converter extracting vanadium protecting method with splash slag will be described in detail in conjunction with exemplary embodiment.In the present invention, as without contrary explanation, then percentage composition all refers to weight percent.
The composition of vanadium slag modification agent according to an aspect of the present invention comprise by weight 2 ~ 5 parts C, 40 ~ 60 parts MgO, the CaO of 4 ~ 7 parts, the MnO of 10 ~ 30 parts, the SiO of 5 ~ 15 parts
2, and the moisture content in described vanadium slag modification agent is less than 3%.Preferably, the composition of vanadium slag modification agent comprise by weight 3 ~ 4 parts C, 45 ~ 55 parts MgO, the CaO of 5 ~ 6 parts, 15 ~ 25 parts of MnO, the SiO of 7 ~ 13 parts
2, and the moisture content in described vanadium slag modification agent is not more than 2%.Such as, the composition of vanadium slag modification agent of the present invention by weight can by 2 ~ 5 parts C, the MgO of 40 ~ 60 parts, the CaO of 4 ~ 7 parts, 10 ~ 30 parts MnO and 5 ~ 15 part SiO
2composition, and the moisture content in vanadium slag modification agent is less than 3%.
Vanadium slag modification agent of the present invention configures for the feature of smelting the vanadium slag that vanadium-bearing hot metal obtains in converter extracting vanadium, when adding in high temperature vanadium slag, in vanadium slag modification agent, each component is fitted to each other thus can effectively improves vanadium slag fusing point and adhesivity, strengthens and spatters slag effect.Such as, C contained by vanadium slag modification agent of the present invention by the FeO reduction in vanadium slag, thus can improve the adhesivity of vanadium slag, and MgO, MnO can adjust the fusing point of vanadium slag, improve the heat impedance of spattering slag blanket, MnO can play the effect of adjustment to the mobility of vanadium slag.
The method preparing vanadium slag modification agent is according to a further aspect of the invention by the magnesia of 40 ~ 50 parts, the manganese ore of 5 ~ 10 parts of carbonaceous materials and 40 ~ 60 parts mix by weight, to obtain vanadium slag modification agent, the composition of described vanadium slag modification agent comprise by weight percentage 2 ~ 5 parts C, the MgO of 40 ~ 60 parts, the CaO of 4 ~ 7 parts, 10 ~ 30 parts MnO and 5 ~ 15 part SiO
2, and the moisture content in described vanadium slag modification agent is less than 3%, wherein, described manganese ore by weight percentage containing be greater than 40% MnO, be less than the CaO of 15% and be less than the SiO of 25%
2, described carbonaceous material is the material containing simple substance carbon.
In the present invention, magnesia is conventional magnesia, preferably, for content of MgO is greater than the magnesia of 90wt%.In the present invention, carbonaceous material is the material containing simple substance carbon, and such as, graphite, coke powder, pitch coke, hard coal etc., preferably, in carbonaceous material, simple substance carbon content is not less than 85wt%.In the present invention, manganese ore can be directly exploit from mine and obtain containing manganese raw ore, such as, 40% can be greater than for MnO content by weight percentage, CaO content is less than 15% and SiO
2content is not more than the manganite, brunite, pyrolusite, psilomelane, hausmannite etc. of 25%.
In one exemplary embodiment of the present invention, preferably, the described method preparing vanadium slag modification agent is by the magnesia of 42 ~ 48 parts, the manganese ore of 6 ~ 9 parts of carbonaceous materials and 43 ~ 55 parts mix, to make vanadium slag modification agent by weight.
In one exemplary embodiment of the present invention, preferably, the granularity of described magnesia is less than 5mm; The granularity of described carbonaceous material is less than 5mm; Described manganese ore is by weight percentage containing being greater than the MnO of 50% and being less than the CaO of 15%, and the granularity of manganese ore is less than 5mm.
Converter extracting vanadium protecting method with splash slag according to another aspect of the invention comprises the following steps: adopt converter extracting vanadium to smelt vanadium-bearing hot metal, to obtain half steel and vanadium slag; Go out half steel, and indwelling predetermined amount vanadium slag is in converter extracting vanadium; In the vanadium slag of indwelling in converter extracting vanadium, add vanadium slag modification agent as above, then carry out slag splashing.Preferably, in described slag splashing step, the add-on of vanadium slag modification agent is 5 ~ 10kg/tFe.
In order to understand the present invention better, further illustrate the present invention below in conjunction with concrete example.
In one exemplary embodiment of the present invention, the method preparing vanadium slag modification agent realizes in the following way: with magnesia, carbonaceous material, manganese ore for raw material, each starting material are mixed by a certain percentage, wherein, magnesia 40 ~ 50%, carbonaceous material 5 ~ 10%, manganese ore 40 ~ 60%, blending ratio suitably can adjust according to the grade of raw material, the vanadium slag modification agent composition range obtained is: C2 ~ 5%, MgO40 ~ 60%, CaO4 ~ 7%, MnO10 ~ 30%, SiO
25 ~ 15%, H
2o<3%.Preferably, wherein, magnesia content of MgO is greater than 90%, granularity <5mm; Carbonaceous material can be graphite, coke powder, pitch coke, hard coal etc., and its carbon content should be not less than 85%, granularity <5mm; Manganese ore is that smelter commonly uses raw material, and its MnO content is greater than 40%, CaO content is less than 15%, granularity <5mm.
Example 1
With magnesia, carbonaceous material, manganese ore for raw material.Wherein, in magnesia, in MgO, weight percentage is 95 ± 1%, and granularity is not more than 4mm; Carbonaceous material is coke powder, and its carbon content is 98 ± 1%, and granularity is not more than 4mm; Manganese ore be directly exploit from mine obtain containing manganese raw ore, wherein MnO content is 50%, CaO content is 2%, SiO
2content is 22%, and granularity is not more than 4mm.
Mixed by a certain percentage by each starting material, wherein magnesia 50 weight part, carbonaceous material 5 weight part, manganese ore 45 weight part, obtain vanadium slag modification agent.
In slag splashing process, the add-on of this vanadium slag modification agent is 8kg/tFe, after using vanadium slag modification agent, can effectively improve vanadium slag fusing point and adhesivity, enhance and spatter slag and dross effect.
Example 2
With magnesia, carbonaceous material, manganese ore for raw material.Wherein, in magnesia, in MgO, weight percentage is 92 ± 1%, and granularity is not more than 3mm; Carbonaceous material is coke powder, and its carbon content is 92 ± 1%, and granularity is not more than 3mm; Manganese ore be directly exploit from mine obtain containing manganese raw ore, wherein MnO content is 42%, CaO content is 3%, SiO
2content is 17%, and granularity is not more than 3mm.
Each starting material are mixed by a certain percentage, wherein magnesia 40 weight part, carbonaceous material 6 weight part, manganese ore 54 weight part, the vanadium slag modification agent obtained.
In slag splashing process, the add-on of this vanadium slag modification agent is 9kg/tFe, after using vanadium slag modification agent, can effectively improve vanadium slag fusing point and adhesivity, enhance and spatter slag and dross effect.
In sum, the problem that when the present invention can solve vanadium slag slag splashing in steelwork converter vanadium extraction production process, vanadium slag fusing point is low, dross is difficult, and vanadium slag fusing point and adhesivity can be improved, dross effect can be improved when using rear employing vanadium slag to carry out slag splashing, improve furnace lining erosion resistibility, thus effectively improve converter extracting vanadium lining life.
Although describe the present invention in conjunction with exemplary embodiment above, those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, can carry out various amendment to above-described embodiment.
Claims (8)
1. a vanadium slag modification agent, is characterized in that, the composition of described vanadium slag modification agent comprise by weight 2 ~ 5 parts C, 40 ~ 60 parts MgO, the CaO of 4 ~ 7 parts, the MnO of 10 ~ 30 parts, the SiO of 5 ~ 15 parts
2, and the moisture content in described vanadium slag modification agent is less than 3%.
2. vanadium slag modification agent according to claim 1, is characterized in that, the composition of described vanadium slag modification agent comprise by weight 3 ~ 4 parts C, 45 ~ 55 parts MgO, the CaO of 5 ~ 6 parts, 15 ~ 25 parts of MnO, the SiO of 7 ~ 13 parts
2, and the moisture content in described vanadium slag modification agent is not more than 2%.
3. prepare the method for vanadium slag modification agent for one kind, it is characterized in that, described method is by the magnesia of 40 ~ 50 parts, the manganese ore of 5 ~ 10 parts of carbonaceous materials and 40 ~ 60 parts mix by weight, to obtain vanadium slag modification agent, the composition of described vanadium slag modification agent comprise by weight percentage 2 ~ 5 parts C, the MgO of 40 ~ 60 parts, the CaO of 4 ~ 7 parts, 10 ~ 30 parts MnO and 5 ~ 15 part SiO
2, and the moisture content in described vanadium slag modification agent is less than 3%, wherein, described manganese ore by weight percentage containing be greater than 40% MnO, be less than the CaO of 15% and be less than the SiO of 25%
2, described carbonaceous material is the material containing simple substance carbon.
4. the method preparing vanadium slag modification agent according to claim 3, is characterized in that, described method is by the magnesia of 42 ~ 48 parts, the manganese ore of 6 ~ 9 parts of carbonaceous materials and 43 ~ 55 parts mix by weight.
5. the method preparing vanadium slag modification agent according to claim 3, is characterized in that, the composition of described vanadium slag modification agent comprise by weight percentage 3 ~ 4 parts C, 45 ~ 55 parts MgO, the CaO of 5 ~ 6 parts, the MnO of 12 ~ 28 parts, the SiO of 7 ~ 13 parts
2, and the moisture content in described vanadium slag modification agent is less than 2%.
6. the method preparing vanadium slag modification agent according to claim 3, is characterized in that, the granularity of described magnesia is less than 5mm; The granularity of described carbonaceous material is less than 5mm, and wherein simple substance carbon content is not less than 85% by weight percentage; Described manganese ore by weight percentage containing be greater than 40% MnO, be less than the CaO of 15% and be less than the SiO of 25%
2, and the granularity of manganese ore is less than 5mm.
7. the method preparing vanadium slag modification agent according to claim 3, is characterized in that, described carbonaceous material is one or more in graphite, coke powder, pitch coke and hard coal.
8. a converter extracting vanadium protecting method with splash slag, is characterized in that, said method comprising the steps of:
Converter extracting vanadium is adopted to smelt vanadium-bearing hot metal, to obtain half steel and vanadium slag;
Go out half steel, and indwelling predetermined amount vanadium slag is in converter extracting vanadium;
Vanadium slag modification agent as claimed in claim 1 or 2 or the vanadium slag modification agent obtained by the method preparing vanadium slag modification agent in claim 3 to 7 as described in any one is added in the vanadium slag of indwelling in converter extracting vanadium, then slag splashing is carried out, wherein, the add-on of vanadium slag modification agent is 5 ~ 10kg/tFe.
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| CN104195283A (en) * | 2014-09-16 | 2014-12-10 | 攀钢集团西昌钢钒有限公司 | Vanadium slag modifier for converter vanadium extraction and converter vanadium extraction smelting method |
| CN109055652A (en) * | 2018-09-19 | 2018-12-21 | 云南德胜钢铁有限公司 | It is a kind of low cost vanadium extraction steel-making splash slag modification agent and its production method |
| CN111960835B (en) * | 2020-08-28 | 2022-05-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Pointing material for reducing oxidation of electric furnace magnesia carbon brick and preparation and use methods thereof |
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| CN102925617B (en) * | 2012-10-31 | 2014-12-17 | 攀钢集团研究院有限公司 | Slag adjusting agent for slag-splashing converter protection of vanadium extracting converter |
| CN102912070B (en) * | 2012-10-31 | 2014-09-03 | 攀钢集团研究院有限公司 | Slag splashing furnace protection method for vanadium extraction converter |
| CN102912072B (en) * | 2012-10-31 | 2014-08-06 | 攀钢集团研究院有限公司 | Low-cost slag regulating agent for vanadium-extracting converter splash protection |
| CN103205525B (en) * | 2013-04-15 | 2015-04-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace protective pellet for vanadium extracting converter and manufacturing method thereof |
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